function enableAll(field)
{
	for (i = 0; i < field.length; i++)
		field[i].disabled = false ;
}
function disableAll(field)
{
	for (i = 0; i < field.length; i++)
		field[i].disabled = true ;
}

function checkAll(field)
{
for (i = 0; i < field.length; i++)
	field[i].checked = true ;
}

function uncheckAll(field)
{
for (i = 0; i < field.length; i++)
	field[i].checked = false ;
}
